Check first if the QUOTA extension is available.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40979 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/IMAPFolders.cpp

@@ -10,7 +10,7 @@
 
 IMAPFolders::IMAPFolders()
 {
-
+	fHandlerList.AddItem(&fCapabilityHandler);
 }
 
 
@@ -18,7 +18,7 @@ IMAPFolders::IMAPFolders(IMAPProtocol& connection)
 	:
 	IMAPProtocol(connection)
 {
-	
+	fHandlerList.AddItem(&fCapabilityHandler);
 }
 
 
@@ -88,6 +88,11 @@ IMAPFolders::UnsubscribeFolder(const char* folder)
 status_t
 IMAPFolders::GetQuota(double& used, double& total)
 {
+	if (fCapabilityHandler.Capabilities() == "")
+		ProcessCommand(fCapabilityHandler.Command());
+	if (fCapabilityHandler.Capabilities().FindFirst("QUOTA") < 0)
+		return B_ERROR;
+
 	GetQuotaCommand quotaCommand;
 	status_t status = ProcessCommand(&quotaCommand);
 	if (status != B_OK)

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/IMAPFolders.h

@@ -43,6 +43,8 @@ public:
 private:
 			status_t			_GetAllFolders(StringList& folders);
 			status_t			_GetSubscribedFolders(StringList& folders);
+
+			CapabilityHandler	fCapabilityHandler;
 };
 
 

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/IMAPHandler.cpp

@@ -105,10 +105,8 @@ MailboxSelectHandler::Handle(const BString& response)
 }
 
 
-CapabilityHandler::CapabilityHandler(IMAPMailbox& mailbox)
+CapabilityHandler::CapabilityHandler()
 	:
-	IMAPMailboxCommand(mailbox),
-
 	fCapabilities("")
 {
 	

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/IMAPHandler.h

@@ -59,9 +59,9 @@ private:
 };
 
 
-class CapabilityHandler : public IMAPMailboxCommand {
+class CapabilityHandler : public IMAPCommand {
 public:
-								CapabilityHandler(IMAPMailbox& mailbox);
+								CapabilityHandler();
 
 			BString				Command();
 			bool				Handle(const BString& response);

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/IMAPMailbox.cpp

@@ -33,7 +33,6 @@ IMAPMailbox::IMAPMailbox(IMAPStorage& storage)
 	fStorage(storage),
 
 	fMailboxSelectHandler(*this),
-	fCapabilityHandler(*this),
 	fExistsHandler(*this),
 	fExpungeHandler(*this),
 	fFlagsHandler(*this),